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"Redo" on a Mac, and a Group Name Warning

Today I released a minor update, fixing a couple bugs:

  1. "Redo" functionality now works as it should on a Mac via the Command-Shift-Z keyboard shortcut.
  2. I've added a group name warning.  There's a weird issue with the way the .NET Regex engine allows numeric entries in group names.  For instance (?<2>abc)|(?<4>def) will not throw an error upon instantiation.  However, when you enumerate through the groups that's when you get a runtime error.  So I've added a rule to show a warning in this case that says, "Group names must begin with a word character, or if they're numeric they cannot have gaps between numbers."
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